A heating device for medical liquids in a container

Abstract

This invention discloses a heating device for medical liquids within a container, comprising a heating element, a control module, and a power module. The heating element includes a heating element body for wrapping the container, and heating elements are disposed on the heating element body. The heating elements include two or more heating units whose temperature is independently controlled by the control module, and the area radiated by each heating unit constitutes a heating zone. The number of heating zones and their arrangement on the heating element body satisfy the following condition: at least in one usage state, there are two or more heating zones in the direction of gravity. This invention enables rapid heating of medical liquids within a container, improving heating efficiency.

Description

Technical Field

[0001] This application relates to the field of medical and nursing device technology, specifically to a heating device for medical liquids in a container. Background Technology

[0002] Currently, sterile medical fluids are generally stored in sealed containers, such as saline bags, saline bottles, medicine bags, and medicine bottles. These containers are typically stored in operating rooms or hospital warehouses. The temperature in operating rooms is generally around 20°C, the ambient temperature, while the temperature in hospital warehouses may be even lower in winter. Human body temperature is typically 36°C to 37°C. Directly administering liquids at this temperature into the human body, such as into the gastrointestinal tract, can easily cause irritation, discomfort, or spasms in patients. Therefore, it is necessary to heat the liquids to human body temperature.

[0003] The existing methods for heating medical liquids mainly include the following:

[0004] The first method involves pouring the medical fluid into a sterile transfer storage container (the container is reusable and sterilized). A heating element at the bottom of the container directly heats the fluid through heat conduction. Patent application CN102631179A discloses a system for enhancing visual clarity in gastrointestinal endoscopy, which addresses the issues of low-temperature and highly irritating rinsing fluids by using a heating plate to heat the rinsing bottle (similar to a kettle principle) and a temperature sensor to monitor the temperature of the rinsing fluid inside. However, this method still requires a fixed container to store saline solution, meaning sterile saline solution still needs to be poured into this container before use. This presents problems such as complex operation, the need for repeated sterilization of the container, and potential contamination during operation and storage.

[0005] The second method involves hanging a medical liquid bag and securing it with two hollow heating pads (connected by an elastic band). The heater inside the hollow heating pad heats and maintains the temperature of the liquid inside the saline container. Patent CN211461513U discloses a portable, large-capacity saline heater, including a hollow first heating pad and a second heating pad connected by an elastic band. Both the first and second heating pads have heaters inside their cavities. However, this type of heater must be hung for use, and the heating pads can only conduct heat to the liquid inside the container through the sides against the outer wall. This results in low thermal conductivity, slow heating, and most of the heat dissipating upwards into the surrounding air, leading to poor heating efficiency. Furthermore, the overall structure and materials of the heater are very complex.

[0006] The third approach involves designing the liquid container as a specialized container incorporating heating pipes. Patent application CN204364573U discloses a heated infusion bag, comprising an infusion bag body and an infusion connector on the bag body. The bag body has a heating mechanism for heating the internal medication. This mechanism includes multiple heating tubes embedded in the side wall of the bag body, a thermally conductive insulating ring layer wrapped around the heating tubes, multiple arc-shaped protrusions evenly distributed on the outer circumference of the insulating ring layer, an auxiliary heating tube in each of the arc-shaped protrusions, and a power plug connected to the heating tubes and auxiliary heating tubes. While this patent achieves heating of the liquid to be delivered, it modifies the structure of the infusion bag itself, essentially making it a specialized container unsuitable for standard saline bags / bottles. Furthermore, the heating mechanism's placement on the side wall of the bag body also results in low heating efficiency. Additionally, infusion bags are typically disposable, significantly increasing usage costs and rendering them impractical. Summary of the Invention

[0007] To address the aforementioned issues, this application provides a heating device for medical liquids within a container, which enables rapid heating of the medical liquids within the container and improves heating efficiency.

[0008] This invention discloses a heating device for medical liquids inside a container, comprising a heating element, a control module, and a power module for supplying power to the control module; the heating element includes a heating element body for wrapping the container, and a heating element is disposed on the heating element body; the heating element includes two or more heating units whose temperature is independently controlled by the control module, and the area radiated by each heating unit constitutes a heating zone; the number of heating zones and their arrangement on the heating element body satisfy the following: at least in one usage state, there are two or more heating zones in the direction of gravity.

[0009] As an alternative, the heating element body is a flexible structure.

[0010] As an optional embodiment, the heating element body includes a thermally conductive layer for conducting heat generated by the heating element. The thermally conductive layer is a flexible thermally conductive material with a thermal conductivity of 0.2–3 W / m·K; the flexible thermally conductive material includes any one of thermally conductive silicone, rubber, or PVC containing thermally conductive fillers.

[0011] As an optional embodiment, the heating element body is further stacked with an outer sheath layer, and the heating element is disposed between the outer sheath layer and the heat-conducting layer. The outer sheath layer is a flexible material with waterproof and heat-insulating properties, including any one of foamed silicone, nylon cloth, PVC cloth, and Oxford cloth.

[0012] As an optional solution, the heating element is a resistive heating element; the resistive heating element includes one or more of the following: metal resistance wire, graphene film, flexible resistive heating film, carbon fiber heating element, and ceramic heating element.

[0013] As an optional solution, a temperature control protection switch with an automatic reset function is also included; the temperature control protection switch is connected in series between the heating unit and the power module in the heating zone.

[0014] As an alternative, the heating element may further include fasteners and / or straps connected to the heating element body, the fasteners being used to secure the heating element body to the outer surface of the container it encloses, and the straps being used to hang the device.

[0015] As an optional solution, the control module includes a main control module and two or more sub-control modules connected in parallel to the main control module.

[0016] As an optional solution, each heating zone is equipped with a temperature sensor; the temperature sensor in each heating zone is electrically connected to the main control module and the sub-control module corresponding to the heating zone where the temperature sensor is located.

[0017] As an optional solution, the heating element body is also equipped with an attitude detection sensor electrically connected to the main control module; the attitude detection sensor includes at least one of a gravity sensor, an acceleration sensor, and an angle sensor.

[0018] The device for heating medical liquids inside a container provided in this application has the following beneficial effects:

[0019] (1) Compared with the prior art, the heating of medical liquid in infusion container can only be achieved by heat conduction. This application realizes a heating method that combines heat convection and heat conduction by designing the arrangement of heating zones in the device and independently controlling the temperature of each heating zone, which greatly improves heating efficiency, reduces heating time, and reduces heat loss.

[0020] (2) This application can customize the number and arrangement of heating zones according to the type, size and shape of the infusion container, as well as the temperature control accuracy requirements and usage requirements.

[0021] (3) In the preferred embodiment of this application, a temperature sensor is configured in each heating zone of the heating element body. Based on the temperature of the heating zone detected by the temperature sensor, abnormal temperature changes in each heating zone are controlled to avoid the phenomenon of device loss due to empty heating of the heating zone caused by the decrease of medical liquid level (i.e., no medical liquid in the heating zone).

[0022] (4) In an optional embodiment of this application, an attitude sensor is configured on the heating element body. Based on the device usage status detected by the attitude sensor, the control module can allocate the initial heating power of the heating zone at different heights in the direction of gravity, promote the formation of heat convection, and further improve the heating efficiency.

[0023] (5) In the optional solution of this application, a temperature control protection switch is set between the heating unit and the power module in each heating zone. The temperature control protection switch is independent of the control module so as to provide dual protection for the device.

[0024] (6) In the optional scheme of this application, the thermal conductive layer is made of a flexible material with good adhesion and thermal conductivity of 0.2 to 3 W / m·K, especially thermally conductive silicone, which can ensure both adhesion and good thermal conductivity.

[0025] (7) This application heats medical liquids in a non-contact manner, eliminating the need to pour the medical liquids into a container first, simplifying surgical procedures, avoiding repeated sterilization of containers, and mitigating the risk of contamination from prolonged storage of liquids in containers. Furthermore, the device has a simple and reliable structure, is reusable, and has very low operating costs. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the heating device described in Example 1. Figure 1 ;

[0027] Figure 2 This is a schematic diagram of the heating device described in Example 1. Figure 2 ;

[0028] Figure 3 This is a schematic diagram of the circuit connection of the heating device described in Example 1;

[0029] Figure 4 This is a schematic diagram showing the usage state of the heating device described in Example 1;

[0030] Figure 5 This is a schematic diagram of the heating device described in Example 2;

[0031] Figure 6 This is a schematic diagram showing the usage state of the heating device described in Example 2;

[0032] Figure 7 This is a schematic diagram of the heating device described in Example 3;

[0033] Figure 8 This is a schematic diagram of the usage state of the heating device described in Example 3. Figure 1 ;

[0034] Figure 9 This is a schematic diagram of the usage state of the heating device described in Example 3. Figure 2 ;

[0035] Figure 10 This is a schematic diagram of the usage state of the heating device described in Example 3. Figure 3 .

[0036] Attached image captions:

[0037] 100-Heating element, 110-Heating element body, 111-Outer sheath, 112-Heat-conducting layer, 113-Heating element, 114-Snap fastener, 120-Strap, 130-Hanging strap; 200-Control module (not shown in the figure); 300-Battery module (not shown in the figure); 400-Temperature sensor; 500-Temperature control protection switch. Detailed Implementation

[0038] The technical solutions of this application will be clearly and completely described below with reference to specific embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0039] In the description of this application, the use of terms such as "upper," "lower," "left," "right," "front," "rear," "inner," "outer," "top," and "bottom," indicating orientation or positional relationships, is based on the orientation or positional relationships shown in the accompanying drawings. These terms are used solely for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the use of terms such as "first" and "second" is used to distinguish similar objects and is not necessarily used to describe a specific order or relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances. In addition, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, but rather to include other units not explicitly listed or inherent to these products or devices.

[0040] Combination Figures 1 to 4 As shown in Embodiment 1 of this application, a heating device (hereinafter referred to as "heating device") for medical liquids in a container is disclosed, which mainly includes a heating element 100, a control module 200, and a power module 300. The control module 200 and the power module 300 are usually set independently of the heating element 100, but can be integrated as a component and electrically connected to the heating element 100 through connectors or cables; or in other optional solutions, the control module 200 and the power module 300 can also be integrated with the heating element 100, but the influence of temperature changes of the heating element 100 should be avoided as much as possible.

[0041] The heating element 100 mainly consists of a heating element body 110 and accessories such as straps 120 and hanging straps 130. Straps 120 are primarily used to secure the heating element body 110 after it wraps around the object being heated, ensuring close contact between the heating element body 110 and the object. Alternatively, straps 120 can be replaced with Velcro, elastic bands, etc., as long as they can secure the container within the heating element body 110. Hanging straps 130 are used to suspend the heating device during use, and this hanging position is generally considered the standard usage position. In addition, the device may also be used horizontally or at an angle, depending on the environment and requirements during use.

[0042] Understandably, in this application, the object to be heated refers to the medical liquid contained in the container, and the container holding the medical liquid can be a commonly used infusion bag, infusion bottle, or other infusion container.

[0043] In terms of size design, the heating element body 110 can be designed as a rectangular structure with a length of 26mm and a width of 22mm. This size can basically cover commonly used 500mL infusion bags and 500mL infusion bottles. Of course, this size design can also be adjusted according to actual needs.

[0044] The heating element body 110 is a flexible structure used to wrap the infusion container. It mainly consists of an outer layer 111, a heat-conducting layer 112, and a heating element 113 disposed between the outer layer 111 and the heat-conducting layer 112. Figure 2 As shown. The outer layer 111 mainly serves waterproof, heat-insulating, and decorative purposes. For example, flexible materials such as foamed silicone, nylon cloth, PVC cloth, and Oxford cloth can be selected. The heat-conducting layer 112 is made of a flexible material with good thermal conductivity and good adhesion. The thermal conductivity is usually 0.2 to 3 W / m·K to ensure good thermal conductivity. For example, flexible heat-conducting materials such as silicone, rubber, and PVC with added alumina thermally conductive filler can be used. The surface of these flexible materials can be tightly attached to the outer surface of the container, thereby achieving efficient heat conduction and heating. The outer layer 111 and the heat-conducting layer 112 can be connected and fixed at the edges, which can be achieved by sewing, snaps 114, and Velcro, or it can be integrally formed with the heating element 113 by pressing.

[0045] The heating element 113 is mainly used to generate heat, and a resistive heating element is preferred. It should be noted that the heating element 113 located between the outer sheath 111 and the thermally conductive layer 112 is laid out in zones according to requirements, that is, it has multiple independently temperature-controlled heating units, and the area radiated by each heating unit constitutes a heating zone. The heating element body 110 usually has more than two heating zones.

[0046] In one alternative embodiment, the heating element 113 is a metal resistance wire, preferably made of a high-temperature resistant, low-cost, and long-term-operational iron-chromium-aluminum alloy. The resistance wire can be arranged in a serpentine pattern and fixed to the surface of the heat-conducting layer 112 by means of bonding or other methods. Understandably, since the resistance wire is flexible and bendable, and is embedded in the flexible heating element body 110, it can be coiled to wrap around and conform to the outer surface of the container being heated.

[0047] In another alternative, the heating element 113 is made of graphene film. Graphene has the advantages of high thermal conductivity, high electrothermal conversion efficiency, uniform heat distribution, good flexibility, and long life, but its price is relatively high. Therefore, graphene film can be selected as the heating element 113 in applications requiring high flexibility.

[0048] In another alternative, the heating element 113 is a flexible resistive heating film, such as a PI heating film or a PET heating film. The flexible resistive heating film mainly consists of a flexible substrate and conductive materials attached to or embedded in the substrate; it generates heat when energized, thus being a resistive heating element.

[0049] In another alternative, the heating element 113 is a carbon fiber heating element. Carbon fiber itself is conductive, and heat is generated due to the resistance effect (Joule heating) when electricity is applied. Carbon fiber heating elements have advantages such as far-infrared radiation, lightweight, and corrosion resistance, but their high-temperature resistance is slightly inferior. Therefore, carbon fiber heating elements can be selected as the heating element 113 in scenarios requiring low-temperature heating or for containers with large external areas.

[0050] In another alternative, the heating element 113 is a ceramic heating element. The ceramic heating element is a conductive ceramic doped with antimony tin oxide and silicon carbide, and it also belongs to the resistive heating element category. Ceramic heating elements are characterized by high temperature resistance and corrosion resistance, but they lack flexibility. Therefore, in non-flexible application scenarios, a ceramic heating element can be selected as the heating element 113.

[0051] It's worth noting that heat conduction and heat convection are two different modes of heat transfer. Heat conduction transfers heat through the thermal motion of microscopic particles such as molecules, atoms, or free electrons, occurring in solids, liquids, and gases. Heat is transferred from a high-temperature region to a low-temperature region. Conduction is more efficient in solids but slower in liquids and gases. Heat convection, on the other hand, transfers heat through the macroscopic motion of fluids, primarily occurring in liquids and gases. The motion of the fluid significantly improves heat transfer efficiency, making it considerably more efficient than heat conduction.

[0052] Specifically, in this application, when a temperature difference exists within a liquid, energy transfer occurs through the microscopic vibrations, displacements, and collisions of molecules, atoms, and electrons within the liquid. This allows heat to be conducted from the high-temperature region to the low-temperature region, which is the most common heat conduction method used in liquid heating. During the heating of medical liquids within a container, when a temperature gradient exists in the direction of gravity and the high-temperature region is located at the bottom, the density difference drives natural objects, resulting in thermal convection. For example, when the fluid at the bottom is heated, the resulting hot fluid expands and decreases in density, generating buoyancy that causes the hot fluid to rise, while the cold fluid above sinks due to gravity, thus forming a convective circulation that transfers heat. In infusion containers, the heating rate of medical liquids via thermal convection is significantly higher than that via thermal conduction.

[0053] In Example 1, the heating pad body 110 has two heating zones along its wrapping direction (i.e., the horizontal direction in the hanging state). The heating pad body 110 can be folded along its centerline to wrap the infusion container (such as an infusion bag or bottle) containing medical fluid, and the medical fluid in the infusion container is heated through these two heating zones. It is understood that the corresponding area is called a heating zone because this area corresponds directly to the location of a set of heating elements 113, and is the area radiated by the heating elements 113. Each heating zone is equipped with a set of heating elements 113, and the temperature of the heating elements 113 in each heating zone is independently controlled by the control module 200.

[0054] The control module 200 is mainly used for heating and temperature control of the heating element 113 in the heating element body 110, so as to achieve rapid heating of the object being heated, i.e., the medical liquid. Figure 3 As shown, the control module 200 typically includes a main control module and multiple sub-control modules. The number of sub-control modules is usually in one-to-one correspondence with the number of heating units, and multiple sub-control modules are connected in parallel to the main control module.

[0055] The power module 300 can use AC mains input, which is converted to low-voltage AC by a transformer and then rectified and regulated to output DC power. This is suitable for scenarios with high lifespan requirements or low cost requirements. Alternatively, it can use AC mains input, which is converted to low-voltage DC output by a switching power supply. This has high power conversion efficiency and is suitable for general scenarios or scenarios with compact size requirements. It can also use battery input, which is converted to low-voltage regulated DC output by a DC-DC circuit. This is suitable for scenarios without AC mains input or in outdoor environments.

[0056] Furthermore, a temperature sensor 400 can be configured in each heating zone to detect the real-time temperature of the object being heated and transmit the temperature signal to the control module 200. The temperature sensor 400 can be a thermistor (NTC / PTC), resistance temperature detector (RTD), thermocouple, or integrated temperature sensor (e.g., DS18B20, which directly outputs a digital signal). The temperature sensor 400 is integrated into the heating element body 110, specifically embedded in the thermally conductive layer 112 or fixed to the inner side of the thermally conductive layer 112 (closer to the object being heated) by bonding, sewing, or other methods.

[0057] In response, the main control module simultaneously receives electrical signals from the temperature sensors 400 in all heating zones, while each sub-control module only receives electrical signals from the temperature sensors in its own heating zone. Based on the received electrical signals, the main control module can intelligently allocate the maximum heating power of each sub-control module and control each sub-control module to reduce its heating power or stop heating altogether.

[0058] It is important to note that since the temperature sensor 400 is positioned between or embedded in the heat-conducting layer 112 and the infusion container, the temperature it detects is, more accurately, the temperature at the interface between the heat-conducting layer 112 and the infusion container. If the heat-conducting layer 112 is in indirect contact with the medical fluid inside the infusion container through the container—that is, if the heat-conducting layer 112 is in close contact with the container wall and there is medical fluid in the heating area—the detected temperature indirectly reflects the temperature change of the object being heated in the heating area. Therefore, the detected temperature can be considered the temperature of the object being heated in the heating area. However, if the infusion container is separated from the heat-conducting layer 112 or there is no medical fluid in the heating area, the temperature detected by the temperature sensor 400 only reflects the temperature change in its own heating area.

[0059] Understandably, infusion bags and infusion bottles are two common types of infusion containers. Infusion bags are typically flexible, i.e., soft bags, with a fully enclosed design. They drain fluid using negative pressure, and as the fluid volume decreases, the infusion bag deforms. When the infusion bag deforms to a certain extent, it may separate from the heating zone. In this case, the temperature change rate (i.e., the slope of the temperature change curve) detected by the control module 200 (specifically, the main control module) in that area will appear abnormal (e.g., the slope suddenly increases). Therefore, it can be set that when the temperature change rate difference exceeds a set threshold, the control module 200 will reduce the heating power of that heating zone (e.g., to a set minimum power P). min (Initiate heating) or stop heating.

[0060] Infusion bottles are typically made of glass or plastic, and are rigid structures. Air needs to be introduced into the bottle through a vent to drain the fluid, preventing deformation of the bottle body. Similarly, as the fluid level decreases in an infusion bottle, the heating element 113 in the upper heating zone only contacts the bottle wall and cannot directly transfer heat to the liquid through contact with the bottle wall. The heating element 113 only heats the bottle body it contacts. Consequently, the temperature detected by the temperature sensor 400 cannot reflect the temperature change of the object being heated; it only represents the temperature change at the interface between the heat-conducting layer 112 and the infusion bottle. At this time, the temperature change rate detected by the temperature sensor 400 in the upper heating zone is significantly different from that detected by the temperature sensor 400 in the lower heating zone. The main control module will control the power module 200 to allocate all or most of its electrical energy to heat the lower heating zone, while the upper heating zone is not heated or only a small portion of its electrical energy is used for heating. This means controlling the heating power of the upper heating zone to decrease (e.g., to a set minimum power P). min (Heating can be performed) or heating can be stopped to ensure constant temperature or rapid heating, while also reducing heat loss.

[0061] In one alternative approach, when the heating device is activated, the main control module distributes the initial heating power equally to each heating zone of the infusion container. The main control module monitors the temperature change rate (i.e., the slope of the temperature change curve) continuously detected by the temperature sensor 400 in real time. When the temperature change rate of one or more heating zones exceeds a set threshold, it indicates that there is no medical fluid in the heating zone and it may only be heating the infusion container. The control module will then reduce the heating power of that heating zone to the set minimum heating power P. min Initiate heating or stop heating altogether.

[0062] In Example 1, the heating pad body 110 has two heating zones in the horizontal direction. In use, the infusion container containing medical fluid is wrapped inside the heating pad body 110 and secured with straps 120. It is understood that infusion bags are generally flat, and infusion bottles are generally round. During use, the two heating zones of the heating pad body 110 are respectively attached to the two sides of a flat infusion bag or the outer periphery of a round infusion bottle, and the heating element 113 heats the medical fluid inside the infusion bag or bottle. In normal use, i.e., in the hanging state, the infusion bag or bottle is placed vertically, and the contact area between the two horizontal heating zones and the medical fluid is basically symmetrical, with little difference in heating power; heating is primarily by heat conduction.

[0063] The applicant understands that, in addition to the normal hanging position, infusion containers are also used in horizontal or angled positions. For example, in some operating rooms or emergency rooms, there may be situations where hooks are unavailable or occupied, making it impossible to hang the infusion containers (infusion bags / bottles), forcing them to be placed horizontally or at an angle. Similarly, in some outdoor or ordinary environments, hooks are often unavailable, again necessitating the horizontal or angled placement of the infusion containers. Therefore, it is necessary to heat the medical fluids inside the horizontally or angled infusion containers to body temperature (around 37°C). Furthermore, some surgeries or examinations are very short, such as gastroscopy or colonoscopy, which typically last about an hour, or when the interval between surgeries is short, significantly increasing the required heating rate of sterile medical fluids. The fluids need to be rapidly heated to body temperature (around 37°C) within a very short time, which is difficult to achieve using only heat conduction.

[0064] In the aforementioned special usage scenarios or when a heating rate is required, the infusion container should be kept flat or tilted during use. For example... Figure 4 As shown, the heating device described in Example 1 is in a horizontal position. On the one hand, since the liquid in the infusion container cannot completely fill the container, especially the infusion bottle, the upper heating zone a1 cannot directly heat the medical liquid through heat conduction from the container wall. This results in the liquid temperature above the container being significantly lower than the liquid below, creating a temperature gradient in the vertical direction (i.e., the direction of liquid gravity). Furthermore, as the amount of liquid in the container gradually decreases, the upper surface of the infusion bag may no longer be in contact with the upper heating zone a1, and the distance between the upper surface of the liquid in the infusion bottle and the upper heating zone a1 gradually increases, making the heat conduction heating method of the upper heating zone a1 increasingly ineffective. The applicant unexpectedly discovered that although the heat conduction effect of the upper heating zone a1 deteriorates at this time, it promotes the formation of heat convection heating. Therefore, by reducing the heating power of the upper heating zone a1 or directly stopping the heating of the upper heating zone a1, it is possible to further promote the rapid heating of the medical liquid in the infusion container through a combination of heat convection and heat conduction when the infusion container is used horizontally or at an angle.

[0065] It is worth noting that in Example 1, two heating zones are set in the wrapping direction, and this arrangement is more suitable for the flat bag-shaped structure of infusion bags. For the circular cross-section structure of infusion bottles, multiple heating zones can be set at equal intervals in the horizontal direction, and each heating zone can be independently temperature controlled. These heating zones are evenly distributed circumferentially around the axis of the infusion bottle after the heating plate body 110 wraps the infusion bottle, forming a surrounding heating.

[0066] Optionally, each heating element 113 is also equipped with a temperature control protection switch 500. The temperature control protection switch 500 is connected in series between the power supply module 300 and the heating element 113 to provide over-temperature protection. When the temperature of the heating element 113 exceeds a set threshold, the circuit is automatically cut off, stopping the heating element 113 from operating. This prevents the heating element 113 from exceeding the set safe temperature due to failure or abnormality of components such as the temperature sensor 400 and the control module 200. The temperature control protection switch 500 can be set at any position between the power supply module 300 and the heating element 113, for example, on or inside the heat-conducting layer 112 or the outer sheath 111 of the heating element 100, or it can be set on the external power supply cable. The temperature protection switch 500 is independent of the main control module and can serve as a backup double insurance function. For example, it can be set to automatically cut off at 45 degrees Celsius (above 37 degrees Celsius) and close again after the temperature returns to 45 degrees Celsius. The 500 temperature control protection switch can be selected from various types, including bimetallic temperature control protection switches with automatic reset function, snap-action temperature controllers, and electronic temperature control protection switches.

[0067] Combination Figure 5 and Figure 6 As shown, Embodiment 2 discloses another heating device, which differs from Embodiment 1 mainly in the arrangement of the heating zones on the heating plate body 110. In Embodiment 2, the two heating zones are arranged vertically, meaning that in the normal hanging state, the medical fluid is temperature-controlled by different sub-control modules in the direction of gravity. The horizontal arrangement of the same heating zone on the heating plate body 110 ensures that the two surfaces of the infusion bag or the infusion bottle are heated evenly around the circumference, and the length of the heating zone completely covers the infusion bag or infusion bottle as much as possible to increase the heating area.

[0068] like Figure 6 As shown, initially, the heating power of the upper and lower heating zones is set to be equal. However, as the liquid in the infusion container decreases and the liquid level drops, the temperature detected by the temperature sensor 400 in the upper heating zone 2a will change from reflecting the temperature of the medical liquid to only reflecting the temperature at the interface between the heat-conducting layer 112 and the infusion container. At this time, the temperature change rate may exceed the set value, thereby triggering the reduction of the upper heating zone 2a to the set minimum heating power P. min Initiate heating or stop heating altogether.

[0069] As a preferred option, when the container is suspended, the upper heating zone 2a can be set to heat with a lower heating power P1 and the lower heating zone 2b with a higher heating power P2 at the start of heating. This creates a significant temperature gradient in the direction of gravity for the medical fluid from the outset, enabling rapid heating of the medical fluid in the infusion container through a combination of heat convection and heat conduction during normal use (suspended state). As the medical fluid level in the infusion container gradually decreases during use, if an abnormal temperature change rate is detected in the upper heating zone 2a (e.g., exceeding a set threshold), the heating power of the upper heating zone 2a can be further reduced to the minimum heating power P. min Or stop heating. It's worth noting that this method not only facilitates heat convection but also reduces heat loss, significantly improving heating efficiency. Furthermore, this method is also applicable to the heating device shown in Example 1. Wherein, P min ≤P1 <P2。

[0070] Understandably, the heating zone arrangement in Example 2 is particularly suitable for routine use. To further refine temperature control and improve heating efficiency, multiple equally spaced heating zones can be arranged along the direction of gravity of the medical liquid, i.e., the vertical direction, with each zone having independent temperature control. Furthermore, compared to Example 1, Example 2 creates a temperature difference in the hanging state, i.e., a temperature difference along the long side or axial direction of the container. The temperature gradient is more pronounced, resulting in more significant heat convection and higher heating efficiency.

[0071] Combination Figures 7 to 10 As shown, Embodiment 3, based on Embodiments 1 and 2, discloses a heating device in which two or more heating zones are provided in both the horizontal and vertical directions of the heating element body 110, and each heating zone is independently temperature-controlled. The advantage of Embodiment 3 compared to Embodiments 1 and 2 is that, in the conventional use state, i.e., vertical hanging, heating zones 3a and 3b are located above heating zones 3c and 3d, as shown... Figure 8 As shown, heating zones 3c and 3d can be set to heat with higher heating power, while heating zones 3a and 3b can be heated with lower heating power or not heated at all. This overcomes the deficiency of Embodiment 1, which cannot heat the liquid inside the container faster through thermal convection when the container is hung vertically. When used in a flat or inclined position, heating zones 3a and 3c are located above heating zones 3b and 3d (and vice versa). Figure 9 As shown, heating zones 3a and 3c can be configured to heat with higher heating power, while heating zones 3b and 3d can be heated with lower heating power or not heated at all. This overcomes the deficiency in Embodiment 2, where the liquid inside the container cannot be heated more quickly through thermal convection when the container is placed horizontally or at an angle. In other words, this heating zone design in Embodiment 3 can heat the liquid inside the container more quickly through thermal convection regardless of the placement method.

[0072] It is worth noting that in other alternative solutions, two or more heating zones can be set in both the horizontal and vertical directions, and the number of heating zones in the two directions does not have to be equal. For example, two heating zones can be set in the horizontal direction, and four heating zones can be set at equal intervals in the vertical direction. The four heating zones can be independently temperature controlled to achieve precise temperature control of medical liquids, while also further improving heating efficiency and reducing heat loss.

[0073] Furthermore, to achieve intelligent control, this application can add attitude sensors such as gravity sensors or orientation sensors to the heating device to detect its usage status, such as whether it is hanging or lying flat. Based on the detected usage status, the control module allocates the initial heating power to each heating zone.

[0074] Taking a gravity sensor as an example, in Embodiment 3, the gravity sensor can be placed at any position on the heating element 100. Specifically, various types of sensors can be selected, such as mechanical cantilever sensors made of elastic sensitive elements, piezoelectric sensors, etc. When the heating device starts heating, the main control module can automatically determine the current placement of the infusion container based on the gravity sensor and select the optimal solution for control.

[0075] Specifically, the gravity sensor transmits an electrical signal representing its current orientation to the main control module, allowing the main control module to differentiate and control the heating power of each heating zone. For example, if the gravity sensor detects that the device is hanging vertically, it transmits a logic digital signal of "0" to the digital signal input of the main control module. The main control module then controls the heating of heating zones 3c and 3d to a higher heating power P2, while heating zones 3a and 3b are heated to a lower heating power P1, through the corresponding sub-control modules.

[0076] Preferably, this application can also use an angle sensor instead of a gravity sensor or a direction sensor to accurately determine different tilt angles in hanging, flat, and oblique states, so as to achieve reasonable power distribution during initial heating. The angle sensor can be arranged at any position on the heating element 100, and a static tilt sensor or other type of sensor can be selected.

[0077] Initially, the main control module automatically determines the placement and tilt angle of the infusion container based on the angle sensor, and allocates the heating power to each zone according to the optimal ratio. For example, in the vertical hanging state, the angle sensor senses... Figure 7 The direction indicated by the middle arrow, that is, the angle X with the horizontal plane is 90 degrees. Figure 10In the shown state, this analog voltage signal information is directly transmitted to the A / D input terminal of the main control module, or after being converted by an analog-digital circuit, the digital signal is directly transmitted to the digital signal input terminal of the main control module. When the main control module receives an angle signal of 90 degrees, it controls the lower heating zones 3c and 3d to heat with a higher heating power P2 through the sub-control module, and the upper heating zones 3a and 3c to heat with a lower heating power P1.

[0078] Furthermore, it can be calculated according to the angle value of X to make different heating powers corresponding to different angles, realizing a more precise initial power distribution.

[0079] Take Figure 10 as an example. At the initial heating, it can be set as follows:

[0080] P 3a0 = k1 * P max

[0081] P 3b0 = k2 * P max

[0082] P 3c0 = k3 * P max

[0083] P 3d0 = k4 * P max

[0084] When X = 0°, k3 = k4 > k1 = k2;

[0085] When 0° < X < 90°, k3 > k4 > k1 > k2;

[0086] When X = 90°, k4 = k3 > k2 = k1;

[0087] When 90° < X < 180°, k4 > k3 > k2 > k1;

[0088] When X = 180°, k2 = k4 > k1 = k3;

[0089] When 180° < X < 270°, k2 > k1 > k4 > k3;

[0090] When X = 270°, k1 = k2 > k3 = k4;

[0091] When 270° < X < 360°, k1 > k2 > k3 > k4;

[0092] In the formula, P max is the maximum heating power set for a single heating zone. The angle range of X is 0 degrees to 360 degrees, 0 ≤ k1, k2, k3, k4 ≤ 1, P min≤P1 <P2≤P max .

[0093] The values ​​of k1, k2, k3, and k4 need to be matched according to the characteristics of the object being heated in order to achieve the best results.

[0094] The sub-control module controls the initial heating power P of heating zone 3c based on the calculation results. 3c0 This ensures that heating is performed at the optimal heating power from the outset.

[0095] Therefore, the aforementioned attitude sensor can detect the device's usage status, such as whether it is hung normally, laid flat, or tilted. Based on the device's usage status, the main control module can allocate the initial heating power to different heating zones to promote heat convection and further improve heating efficiency.

[0096] It is understood that in other embodiments, the container carrying the medical liquid in this application is not necessarily an infusion container. It can also be a liquid-carrying container for cooling or heating (temperature control) medical devices, such as water cooling, liquid cooling, or constant temperature systems for medical devices; a liquid-carrying container in medical devices used for human treatment or physiotherapy, such as thermotherapy or hot compress medical devices; a liquid-carrying container for heat dissipation and conduction of medical device components, such as a container for liquid circulating in the energy generation area (such as the needle tip of a microwave ablation needle or the laser emission end of a laser ablation needle) in microwave ablation or laser ablation medical devices; a liquid-carrying container for filling, such as a liquid container for filling a medical balloon; a liquid-carrying container for medical devices that conduct electricity for treatment, such as a saline container for radiofrequency ablation; a liquid-carrying container for cleaning and defogging medical device components, such as a liquid-carrying container for rinsing and defogging an endoscope lens; or a medical liquid-carrying container combining multiple of the above functions. This application does not impose any limitations on this.

[0097] In summary, this application achieves heating of medical liquids in containers through a combination of heat conduction and heat convection by arranging the heating zones and controlling the temperature independently. This avoids the need for repeated sterilization of the containers and the potential for contamination, as well as the problem of excessive temperature difference between the liquid temperature introduced into the human body and the temperature of the gastrointestinal tract. At the same time, it greatly improves heating efficiency and reduces heat loss.

[0098] Finally, it should be noted that although the technical solutions of this application have been described above in conjunction with the accompanying drawings and embodiments, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and guiding, and not restrictive. Those skilled in the art, under the guidance of this specification, can make many other forms without departing from the scope of protection of the claims of this application, and these all fall within the scope of protection of this application.

Claims

1. A heating device for medical liquids in a container, characterized in that It includes a heating element, a control module, and a power supply module for supplying power to the control module; The heating element includes a heating element body for wrapping the container, and the heating element body is equipped with a heating element; the heating element includes two or more heating units whose temperature is independently controlled by the control module, and the area radiated by each heating unit constitutes a heating zone; The number of heating zones and their arrangement on the heating element body satisfy the following: at least in one usage state, there are two or more heating zones in the direction of gravity.

2. The heating device of claim 1, wherein The heating element body has a flexible structure.

3. The heating device as described in claim 1, characterized in that, The heating element body includes a heat-conducting layer for conducting the heat generated by the heating element.

4. The heating device as described in claim 3, characterized in that, The heating element body is also stacked with an outer cladding layer, and the heating element is arranged between the outer cladding layer and the heat-conducting layer.

5. The heating device as described in claim 4, characterized in that, The thermally conductive layer is any one of thermally conductive silicone, rubber, or PVC containing thermally conductive filler; the outer layer is any one of foamed silicone, nylon cloth, PVC cloth, or Oxford cloth.

6. The heating device as described in claim 1, characterized in that, The heating element is a resistive heating element; the resistive heating element includes one or more of the following: metal resistance wire, graphene film, flexible resistive heating film, carbon fiber heating element, and ceramic heating element.

7. The heating device as claimed in claim 1, characterized in that, It also includes a temperature control protection switch with an automatic reset function; the temperature control protection switch is connected in series between the heating unit and the power module in the heating zone.

8. The heating device as claimed in claim 1, characterized in that, The heating element also includes fasteners and / or straps connected to the heating element body. The fasteners are used to fix the heating element body to the outer surface of the container it covers, and the straps are used to hang the heating device.

9. The apparatus according to any one of claims 1 to 8, characterized in that, The control module includes a main control module and two or more sub-control modules connected in parallel to the main control module.

10. The heating device as described in claim 9, characterized in that, Each heating zone is equipped with a temperature sensor; the temperature sensor in each heating zone is electrically connected to the main control module and the sub-control module corresponding to the heating zone where the temperature sensor is located.

11. The heating device as claimed in claim 10, characterized in that, The heating element body is also equipped with an attitude detection sensor that is electrically connected to the main control module; the attitude detection sensor includes at least one of a gravity sensor, an acceleration sensor, and an angle sensor.

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